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                                <h2 id="&#x4E09;-sql&#x8BED;&#x53E5;">(&#x4E09;) SQL&#x8BED;&#x53E5;</h2>
<ol>
<li>&#x3010;&#x5F3A;&#x5236;&#x3011;&#x4E0D;&#x8981;&#x4F7F;&#x7528;count(&#x5217;&#x540D;)&#x6216;count(&#x5E38;&#x91CF;)&#x6765;&#x66FF;&#x4EE3;count(<em>)&#xFF0C;count(</em>)&#x662F;SQL92&#x5B9A;&#x4E49;&#x7684;&#x6807;&#x51C6;&#x7EDF;&#x8BA1;&#x884C;&#x6570;&#x7684;&#x8BED;&#x6CD5;&#xFF0C;&#x8DDF;&#x6570;&#x636E;&#x5E93;&#x65E0;&#x5173;&#xFF0C;&#x8DDF;NULL&#x548C;&#x975E;NULL&#x65E0;&#x5173;&#x3002; 
<br><span style="color:orange">&#x8BF4;&#x660E;</span>&#xFF1A;count(*)&#x4F1A;&#x7EDF;&#x8BA1;&#x503C;&#x4E3A;NULL&#x7684;&#x884C;&#xFF0C;&#x800C;count(&#x5217;&#x540D;)&#x4E0D;&#x4F1A;&#x7EDF;&#x8BA1;&#x6B64;&#x5217;&#x4E3A;NULL&#x503C;&#x7684;&#x884C;&#x3002; </li>
<li>&#x3010;&#x5F3A;&#x5236;&#x3011;count(distinct col) &#x8BA1;&#x7B97;&#x8BE5;&#x5217;&#x9664;NULL&#x4E4B;&#x5916;&#x7684;&#x4E0D;&#x91CD;&#x590D;&#x884C;&#x6570;&#xFF0C;&#x6CE8;&#x610F; count(distinct col1, col2) &#x5982;&#x679C;&#x5176;&#x4E2D;&#x4E00;&#x5217;&#x5168;&#x4E3A;NULL&#xFF0C;&#x90A3;&#x4E48;&#x5373;&#x4F7F;&#x53E6;&#x4E00;&#x5217;&#x6709;&#x4E0D;&#x540C;&#x7684;&#x503C;&#xFF0C;&#x4E5F;&#x8FD4;&#x56DE;&#x4E3A;0&#x3002; </li>
<li>&#x3010;&#x5F3A;&#x5236;&#x3011;&#x5F53;&#x67D0;&#x4E00;&#x5217;&#x7684;&#x503C;&#x5168;&#x662F;NULL&#x65F6;&#xFF0C;count(col)&#x7684;&#x8FD4;&#x56DE;&#x7ED3;&#x679C;&#x4E3A;0&#xFF0C;&#x4F46;sum(col)&#x7684;&#x8FD4;&#x56DE;&#x7ED3;&#x679C;&#x4E3A;NULL&#xFF0C;&#x56E0;&#x6B64;&#x4F7F;&#x7528;sum()&#x65F6;&#x9700;&#x6CE8;&#x610F;NPE&#x95EE;&#x9898;&#x3002; 
<br><span style="color:green">&#x6B63;&#x4F8B;</span>&#xFF1A;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x5982;&#x4E0B;&#x65B9;&#x5F0F;&#x6765;&#x907F;&#x514D;sum&#x7684;NPE&#x95EE;&#x9898;&#xFF1A;<pre class="language-">SELECT IF(ISNULL(SUM(g)),0,SUM(g)) FROM table; </pre></li>
<li>&#x3010;&#x5F3A;&#x5236;&#x3011;&#x4F7F;&#x7528;<code>ISNULL()</code>&#x6765;&#x5224;&#x65AD;&#x662F;&#x5426;&#x4E3A;NULL&#x503C;&#x3002; &#x8BF4;&#x660E;&#xFF1A;NULL&#x4E0E;&#x4EFB;&#x4F55;&#x503C;&#x7684;&#x76F4;&#x63A5;&#x6BD4;&#x8F83;&#x90FD;&#x4E3A;NULL&#x3002;<br>1&#xFF09; <code>NULL&lt;&gt;NULL</code>&#x7684;&#x8FD4;&#x56DE;&#x7ED3;&#x679C;&#x662F;NULL&#xFF0C;&#x800C;&#x4E0D;&#x662F;<code>false</code>&#x3002;<br>2&#xFF09; <code>NULL=NULL</code>&#x7684;&#x8FD4;&#x56DE;&#x7ED3;&#x679C;&#x662F;NULL&#xFF0C;&#x800C;&#x4E0D;&#x662F;<code>true</code>&#x3002;<br>3&#xFF09; <code>NULL&lt;&gt;1</code>&#x7684;&#x8FD4;&#x56DE;&#x7ED3;&#x679C;&#x662F;NULL&#xFF0C;&#x800C;&#x4E0D;&#x662F;<code>true</code>&#x3002; </li>
<li>&#x3010;&#x5F3A;&#x5236;&#x3011; &#x5728;&#x4EE3;&#x7801;&#x4E2D;&#x5199;&#x5206;&#x9875;&#x67E5;&#x8BE2;&#x903B;&#x8F91;&#x65F6;&#xFF0C;&#x82E5;count&#x4E3A;0&#x5E94;&#x76F4;&#x63A5;&#x8FD4;&#x56DE;&#xFF0C;&#x907F;&#x514D;&#x6267;&#x884C;&#x540E;&#x9762;&#x7684;&#x5206;&#x9875;&#x8BED;&#x53E5;&#x3002; </li>
<li>&#x3010;&#x5F3A;&#x5236;&#x3011;&#x4E0D;&#x5F97;&#x4F7F;&#x7528;&#x5916;&#x952E;&#x4E0E;&#x7EA7;&#x8054;&#xFF0C;&#x4E00;&#x5207;&#x5916;&#x952E;&#x6982;&#x5FF5;&#x5FC5;&#x987B;&#x5728;&#x5E94;&#x7528;&#x5C42;&#x89E3;&#x51B3;&#x3002; 
<br><span style="color:orange">&#x8BF4;&#x660E;</span>&#xFF1A;&#x4EE5;&#x5B66;&#x751F;&#x548C;&#x6210;&#x7EE9;&#x7684;&#x5173;&#x7CFB;&#x4E3A;&#x4F8B;&#xFF0C;&#x5B66;&#x751F;&#x8868;&#x4E2D;&#x7684;student_id&#x662F;&#x4E3B;&#x952E;&#xFF0C;&#x90A3;&#x4E48;&#x6210;&#x7EE9;&#x8868;&#x4E2D;&#x7684;student_id&#x5219;&#x4E3A;&#x5916;&#x952E;&#x3002;&#x5982;&#x679C;&#x66F4;&#x65B0;&#x5B66;&#x751F;&#x8868;&#x4E2D;&#x7684;student_id&#xFF0C;&#x540C;&#x65F6;&#x89E6;&#x53D1;&#x6210;&#x7EE9;&#x8868;&#x4E2D;&#x7684;student_id&#x66F4;&#x65B0;&#xFF0C;&#x5373;&#x4E3A;&#x7EA7;&#x8054;&#x66F4;&#x65B0;&#x3002;&#x5916;&#x952E;&#x4E0E;&#x7EA7;&#x8054;&#x66F4;&#x65B0;&#x9002;&#x7528;&#x4E8E;&#x5355;&#x673A;&#x4F4E;&#x5E76;&#x53D1;&#xFF0C;&#x4E0D;&#x9002;&#x5408;&#x5206;&#x5E03;&#x5F0F;&#x3001;&#x9AD8;&#x5E76;&#x53D1;&#x96C6;&#x7FA4;&#xFF1B;&#x7EA7;&#x8054;&#x66F4;&#x65B0;&#x662F;&#x5F3A;&#x963B;&#x585E;&#xFF0C;&#x5B58;&#x5728;&#x6570;&#x636E;&#x5E93;&#x66F4;&#x65B0;&#x98CE;&#x66B4;&#x7684;&#x98CE;&#x9669;&#xFF1B;&#x5916;&#x952E;&#x5F71;&#x54CD;&#x6570;&#x636E;&#x5E93;&#x7684;&#x63D2;&#x5165;&#x901F;&#x5EA6;&#x3002; </li>
<li>&#x3010;&#x5F3A;&#x5236;&#x3011;&#x7981;&#x6B62;&#x4F7F;&#x7528;&#x5B58;&#x50A8;&#x8FC7;&#x7A0B;&#xFF0C;&#x5B58;&#x50A8;&#x8FC7;&#x7A0B;&#x96BE;&#x4EE5;&#x8C03;&#x8BD5;&#x548C;&#x6269;&#x5C55;&#xFF0C;&#x66F4;&#x6CA1;&#x6709;&#x79FB;&#x690D;&#x6027;&#x3002; </li>
<li>&#x3010;&#x5F3A;&#x5236;&#x3011;&#x6570;&#x636E;&#x8BA2;&#x6B63;&#xFF08;&#x7279;&#x522B;&#x662F;&#x5220;&#x9664;&#x3001;&#x4FEE;&#x6539;&#x8BB0;&#x5F55;&#x64CD;&#x4F5C;&#xFF09;&#x65F6;&#xFF0C;&#x8981;&#x5148;select&#xFF0C;&#x907F;&#x514D;&#x51FA;&#x73B0;&#x8BEF;&#x5220;&#x9664;&#xFF0C;&#x786E;&#x8BA4;&#x65E0;&#x8BEF;&#x624D;&#x80FD;&#x6267;&#x884C;&#x66F4;&#x65B0;&#x8BED;&#x53E5;&#x3002; </li>
<li>&#x3010;&#x63A8;&#x8350;&#x3011;in&#x64CD;&#x4F5C;&#x80FD;&#x907F;&#x514D;&#x5219;&#x907F;&#x514D;&#xFF0C;&#x82E5;&#x5B9E;&#x5728;&#x907F;&#x514D;&#x4E0D;&#x4E86;&#xFF0C;&#x9700;&#x8981;&#x4ED4;&#x7EC6;&#x8BC4;&#x4F30;in&#x540E;&#x8FB9;&#x7684;&#x96C6;&#x5408;&#x5143;&#x7D20;&#x6570;&#x91CF;&#xFF0C;&#x63A7;&#x5236;&#x5728;1000&#x4E2A;&#x4E4B;&#x5185;&#x3002; </li>
<li>&#x3010;&#x53C2;&#x8003;&#x3011;&#x5982;&#x679C;&#x6709;&#x5168;&#x7403;&#x5316;&#x9700;&#x8981;&#xFF0C;&#x6240;&#x6709;&#x7684;&#x5B57;&#x7B26;&#x5B58;&#x50A8;&#x4E0E;&#x8868;&#x793A;&#xFF0C;&#x5747;&#x4EE5;utf-8&#x7F16;&#x7801;&#xFF0C;&#x6CE8;&#x610F;&#x5B57;&#x7B26;&#x7EDF;&#x8BA1;&#x51FD;&#x6570;&#x7684;&#x533A;&#x522B;&#x3002; 
<br><span style="color:orange">&#x8BF4;&#x660E;</span>&#xFF1A;
<pre class="language-">SELECT LENGTH(&quot;&#x8F7B;&#x677E;&#x5DE5;&#x4F5C;&quot;)&#xFF1B; &#x8FD4;&#x56DE;&#x4E3A;12
SELECT CHARACTER_LENGTH(&quot;&#x8F7B;&#x677E;&#x5DE5;&#x4F5C;&quot;)&#xFF1B; &#x8FD4;&#x56DE;&#x4E3A;4</pre>
&#x5982;&#x679C;&#x9700;&#x8981;&#x5B58;&#x50A8;&#x8868;&#x60C5;&#xFF0C;&#x90A3;&#x4E48;&#x9009;&#x62E9;utf8mb4&#x6765;&#x8FDB;&#x884C;&#x5B58;&#x50A8;&#xFF0C;&#x6CE8;&#x610F;&#x5B83;&#x4E0E;utf-8&#x7F16;&#x7801;&#x7684;&#x533A;&#x522B;&#x3002; </li>
<li>&#x3010;&#x53C2;&#x8003;&#x3011; TRUNCATE TABLE &#x6BD4; DELETE &#x901F;&#x5EA6;&#x5FEB;&#xFF0C;&#x4E14;&#x4F7F;&#x7528;&#x7684;&#x7CFB;&#x7EDF;&#x548C;&#x4E8B;&#x52A1;&#x65E5;&#x5FD7;&#x8D44;&#x6E90;&#x5C11;&#xFF0C;&#x4F46;TRUNCATE&#x65E0;&#x4E8B;&#x52A1;&#x4E14;&#x4E0D;&#x89E6;&#x53D1;trigger&#xFF0C;&#x6709;&#x53EF;&#x80FD;&#x9020;&#x6210;&#x4E8B;&#x6545;&#xFF0C;&#x6545;&#x4E0D;&#x5EFA;&#x8BAE;&#x5728;&#x5F00;&#x53D1;&#x4EE3;&#x7801;&#x4E2D;&#x4F7F;&#x7528;&#x6B64;&#x8BED;&#x53E5;&#x3002; 
<br><span style="color:orange">&#x8BF4;&#x660E;</span>&#xFF1A;TRUNCATE TABLE &#x5728;&#x529F;&#x80FD;&#x4E0A;&#x4E0E;&#x4E0D;&#x5E26; WHERE &#x5B50;&#x53E5;&#x7684; DELETE &#x8BED;&#x53E5;&#x76F8;&#x540C;&#x3002; </li>
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